Comparison of different methods to assess the seasonal and diurnal activity of ambrosia beetles (Coleoptera: Scolytinae)

Ambrosia beetle attack rates on ethanol-injected and ethanol drenched trees were compared to numbers of ambrosia beetles captured in traps baited with traditional ethanol lures or ethanol-injected tree bolts. The seasonal timing of trap captures and tree attacks, as well as ambrosia beetle species, were also collected during the study. Three species of ambrosia beetle in the genus Xylosandrus were recovered with the granulate ambrosia beetle (Xylosandrus crassiusculus) being the predominate species. In a separate test, the diurnal timing of ambrosia beetle attacks were also collected using ethanol injected white oak trees.